Definición de rubber bullet en inglés:

sustantivo

The best example of this is the rubber bullet which, even though it is much softer than a standard metal bullet, and has a lower velocity, can still cause serious injury, or even death, depending on where it hits you.

One pulled out a firearm and fired off a rubber bullet.

Sarah isn't afraid to speak her mind - even if it means taking a rubber bullet or breathing tear gas.